Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9b6605ada1db
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26828 from KevinGrandon/bug_1111802_private_browser_collapsed

Bug 1111802 - [PrivateBrowser] Fix collapsed background colors r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/341cde5da27c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1111802 - [PrivateBrowser] Fix collapsed background colors
Bumping manifests a=b2g-bump